Chemistry - January 2007

2007-01-04 10:21:32 · 6 answers · asked by walrus72 1

It's about making polymers and its chemistry

2007-01-04 10:07:11 · 7 answers · asked by Anonymous

soem questions are-

If the number of protons are equal to the number of electrons, the overall charge of the nucelus would be __

Chlorine has a high electron___ because it attracts electrons easily


In an electron dot-diagram, just the ___ electrons are illustrated


in mettallic bonds, many electrons are__ by many atoms

True or False:

chemical bonding is the process of atoms combining to form new substances

the thrid energy level can hold up to as many 14 electrons

2007-01-04 09:44:13 · 5 answers · asked by Anonymous

2007-01-04 09:31:21 · 2 answers · asked by Ryoma Echizen 3

A solution is prepared where a bit of Fe2+ is added to a solution where the [OH-] is 1E-2M. Some Fe(OH)2 precipitates. Ksp for Fe(OH)2 is 8E-10.

How do I calculate the concentration of Fe? I have solved for the half reactions and I got

Ox: 2(Fe -> Fe2+ +2e-)
Red: O2 + 2H2O +4e- -> 4OH-

Ox Volt= .44
Red Volt= .40
Total Volt= .84

I don't know if that's helpful, but I have to solve for the Fe2+ concentration and use it to find the cell potential with the Nernst equation. Any help would be greatly appreciated!

2007-01-04 08:59:15 · 1 answers · asked by Anonymous

if a sample of 8.26 g of Barium hydroxide dissolved and diluted to the mark in a 250 mL flask.
it was found that 8.69 mL of this solution was needed to reach the stoichimetric point in a titration of 28.6 mL of HNO3. What is the molarity of the HNO3 solution?

i did it out and got 3.37 M?
is this correct?

2007-01-04 08:57:55 · 1 answers · asked by Anonymous

2007-01-04 08:45:30 · 3 answers · asked by romaranger151 1

Which ones? I need to know 4 my SCIENCE project (sry bout the caps)

2007-01-04 08:34:21 · 5 answers · asked by Anonymous

Consider the following data for Na2SO4

Temperature (C) 0 20 50 100


Solubility (g/100gH2O )4.76625041

What is the relationship between the temperature and the amount of dissolved material?
Given that sodium sulfate is a solid, what is unusual about the data given about?

2007-01-04 08:30:42 · 1 answers · asked by henry f 2

this is chemistry

2007-01-04 08:27:10 · 7 answers · asked by Anonymous

2007-01-04 08:09:25 · 2 answers · asked by shade_ghj 1

all natural activated charcoal like bamboo charcoal, coconut charcoal and etc.

2007-01-04 07:47:14 · 2 answers · asked by marlena724 1

What is the difference between the kinds of sulpha found in things like Eggs and onions and the kinds of Sulpha based topicals used to treat skin conditions?

I mean like their structure and physical make up?

2007-01-04 07:43:50 · 2 answers · asked by Anonymous

Suppose you have a positively charged acetate strip, and two uncharged metal spheres mounted on insulating stands. Describe how to use the charged strip to charge one sphere positively and one sphere negatively by electrostatic induction.

2007-01-04 07:40:30 · 1 answers · asked by ☺ Joel ☺ 1

CONSIDER THE FOLLOWING:
NaOH+HCI--------NaCL+H2O

a)what is the molar concentration of 10% NaOH?
B)WHAT IS THE VOLUME OF 10%NaOh solution contein 1 mole of NaOH?

2007-01-04 07:39:46 · 3 answers · asked by celcia d 1

i do not want to offend anyone but isnt this the whole point of this site? i really appreciate all the help i have received from people it has made my understanding of somethings much better!! i think this site is great and who ever thought of this idea.... well ur gr8!
Thank you!!!!!!

2007-01-04 07:37:40 · 6 answers · asked by Anonymous

I need to find the reactants,products and subscripts. I need to find what compounds the formula represents and i need to know whether the equations are balanced.

Here are the equations
(1.) HCl + NaOH = NaCl + H2O
(2.) CH4 + O2 = CO2 + H2O
(3.) Mg + O2 = MgO

Please help

2007-01-04 07:32:36 · 2 answers · asked by RedruM 3

2007-01-04 07:23:27 · 1 answers · asked by Anonymous

the operation of a pressure cooker??????

2007-01-04 07:15:50 · 3 answers · asked by Hally berry 3

temperture on a mountian point?????

2007-01-04 07:14:47 · 3 answers · asked by Hally berry 3

2007-01-04 07:05:59 · 12 answers · asked by Anonymous

between the trems of boiling point and normal boiling point ?????

2007-01-04 06:59:05 · 5 answers · asked by Hally berry 3

I presume that the colours we see in our everyday life is due to molecular structure, Grey coloured Graphite structure can be altered to give a Clear Dimon.
Can it be that atoms are too small to have any colour?
But what in a metallic bonding gives gold one look and silver another?
Am i just looking at this in a wrong way and thats the reason that it doesnt make any sence?

2007-01-04 06:51:48 · 17 answers · asked by dom 1

and it's vapour in an open container as the temperture is increased?????

2007-01-04 06:36:20 · 2 answers · asked by Hally berry 3

the vapour pressures of a liqiud depend on the intermolecular forces??????

2007-01-04 06:34:38 · 3 answers · asked by Hally berry 3

mean by saying that involves a danymic equilibrium???????

2007-01-04 06:33:06 · 1 answers · asked by Hally berry 3

how many cubic centimetres of a solution of hydrochloric acic, of concentration 2 mol dm-3, are required to react completely with 50cm3 of a solution of barium hydroxide that contains 68.4 g dm-3?

2HCl (aq) + Ba(OH)2 (aq) ==> BaCl2 (aq) + 2H2O(l)

the answer given is actually 20 cm3, but i just dont know how to get to that, so can you show all the steps of your working out of how to get to that answer. thanks

2007-01-04 06:32:22 · 2 answers · asked by b2606 1

an impuirty have on freezing point of a pure liqiud ?????

2007-01-04 06:31:33 · 2 answers · asked by Hally berry 3

on a molecular level as a liquid is colled to it's freezing point

plz asap!!!!!!!

2007-01-04 06:30:24 · 1 answers · asked by Hally berry 3

when a degradable plastic decays, the starch or cellulose backbone may break down completely into carbon dioxide, water and organic matter.

a)what happens to the F, Cl, or heteroatom groups on the plymer chains as the backbone decays
b)why might this be a problem?

2007-01-04 06:03:34 · 1 answers · asked by bubbles89 1